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Amount of substance

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Question 25

What is the minimum volume, in cm3\text{cm}^3cm3, of 0.020 mol dm-3 K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7K2​Cr2​O7​ solution needed to oxidise 0.018 mol of Fe2+\text{Fe}^{2+}Fe2+?

Cr2O72−+6Fe2++14H+→2Cr3++6Fe3++7H2O \text{Cr}_2\text{O}_7^{2-} + 6\text{Fe}^{2+} + 14\text{H}^+ \rightarrow 2\text{Cr}^{3+} + 6\text{Fe}^{3+} + 7\text{H}_2\text{O} Cr2​O72−​+6Fe2++14H+→2Cr3++6Fe3++7H2​O
A

151515

B

909090

C

150150150

D

540540540

Markscheme

Amount of substance Questions

  1. A Level
  2. /Chemistry
  3. /Amount of substance

79 exam-style questions on AQA A Level Chemistry Amount of substance, covering Relative atomic mass and relative molecular mass, The mole and the Avogadro constant, The ideal gas equation, Empirical and molecular formula, and Balanced equations and associated calculations. Each one has a worked solution and a mark scheme showing where the marks go.

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